Coating and stripping device



21, 1931, P: CARLSON 2,102,679

COATING AND STRIPPING DEVICE Filed Oct. 1,1955

INVENTOR. Frank E Carlson ATTORNEY.

,.4o able, relatively soft and 55 by assuring the Patented in... 21,1937.

UNITED STATES PATENT 1 o'FFIcE' 2,102,679 con-mm ND s-rmrrmc DEVICEFrank I; Carlson, New York. N. Y.

Application October 1, momma.

' This invention relates to coating and stripping devices similar tothose shownand described in my co-pending-application, Serial No.735,556, filed July 17th, 1934, for Coating and stripping,

- and of which the present case is a continuation n part.

The objects of this invention'are to provide a machine whereby sheetwork in general, and particularly sheet work .inherent body stiffness,may be coatedwithout the employment of grippers for propelling the workwhile the coating is applied thereto. Another object of y a machine forcoating individual, relatively p able, soft, thin sheets in which thecoating operation takes place simultaneously with theproepellingopet'ation of the'work, and in which the work is stripped in respect tothe coating means at the moment the coating is being applied, allwithout the use of grippers. I

Another object of this invention is to provide within such coatingdevice suitably operable work-supporting and work-propelling means,whereby the work is caused to temporarily adhere to, or to be retainedby, or to be held and forced against a movable supporting surface, whilebeing coated, for the purpose of stripping and conveying the work duringthe coating operation without the employment of grippers.

Still another object of this invention is to provide in a coatingdevice, and in connection with a movable work-supportingandwork-propelling means suitable stripping devices for separating thecoated work from such work-supporting and propelling means, immediatelyafter the application of a coating to the work. v 4

Another object of this invention is toso con struct and arrange thecoating device as to-render it applicable for providing a coatingto'plithin sheets in either the form-of strips or upon the entire faceor upon parts of its face, at any desired arrangement, and in which" thevarious coating styles may be achieved by only an insignificantre-setting of the different parts constituting the device. I

A stilifurther objectv of this invention is to provide in connectionwiththe movable work-attracting, work support means for preciselycontrolling the traction-producing medium within which .the work supportoperates. Another object of this invention is to provide variouskin'dsof coating supplying means and g me whereby the work is caused to beforced again t the movable work support, thereadherence of the workagainst which does not possess an this invention is to providi."

- vice in a purely diagrammatical form,

.' in which operates within 1935, Serial No. 42.996

such work support during the coating operation.

A still further object ofthis invention is to provide in conjunctionwith a coating device of this kind, guard means extending into theworking range-of the movable work support and 5 the coatingapplyingmeans cooperating there-j with for preventing inadvertentdeviation of the coated work from its intended path. 1

The foregoing and a number of other important objects and advantages ofthe present in-' vention will become more fully apparent from thefollowing description and the accompanying drawing, the latterillustrating the principles and inost important features of the presentde-' and which 15 drawing is to serve for explanatory purposes only, andtherefore are not intended to limit my invention in any way to theactual showing, and

Fig. 1 is a diagrammatical side elevation of one 20 form of my device,showing the essential parts thereof in one form of their arrangement; 1

Fig. 2 is a partial fi 'ont elevation of my device, in which the feederportion is left oh and in which therear parts are not illustrated;

Fig. 3 is a diagrammatical side elevation of a similar arrangement tothat shown in Fig. l, with some of itsparts disposed in a somewhatdifferent order from that seen in Fig. 1;

Fig. 4 isa side elevation of a modified form my device, showndiagrammaticallm'in which the coating applying means differ inconstruction from those shown in Figs. 1 and 3; and

Fig. 5 is a side elevation of still another modiflcation in which thecoating applying means 35 takes the form of a spray underpressure. Y

Referring now specifically to the Figures 1 and 2, numeral l0 denotes awork support in the form of a roller, which is preferably provided witha hard, highly polished but which may be provided with minute suctioncups, if so, desired. This work supporting roller awell or dish I l{partially filled with a quickly, evaporative adhesive l2, such asvarnish, glue, or any similar form of tack-pro- 45 ducing substance, Theamount of the adhesive medium elevated and applied over the surface ofthe work supporting roller I0 'is governed by minutely adjustabledoctorblade II, which is flexible and which bears against the'entirelength so of the outer surface of roller its It will, be observedthat the blade presses against the surface and is not turned with itsedge against the direction of'rotation of roller ill, but on thecontrary, glides, so to speak. in

surface, such as chromium, 40 j I supporting roller III is mounted in aroller II, and which is provided at its applying surface with aresilient covering l5, preferably of rubber or the like. This coatingapplying roller is lodged within an adjustable bearing l5, held inconnecting arm l1, which latter is adjustable by means of an adjustingscrew l3. At the-upper eccentric i9,

end of adjustable arm l1, there is provided an within which is-lodged at20 a transfer roller 2|.

Roller 2i cooperates with roller l4, and also -with pick-up roller 22,which is preferably equippedwith a resilient working surface 23. Roller22 operates within a tank 24, filled with coating 25, which is to beapplied to the work. In cooperationwith roller 22, there is a doctorroller 26, 'adjustably lodged at 21. All of the rollers I ll, l4, 2|,22, and 23 are geared with one another, so that their operation ispositive.

It will be observed that roller i3 is offset relative to roller l4, andthat feeder 23 is so inclined as to deliver a sheet 29 between the tworollers at practically righ t angles to the center line passing throughthe bearings of these rollers. -At the right-hand side ofwork-supporting roller i3, therewill be seen strippers 33, in the formof a -'plurality of sharp fingers; which lightly rest against rollerIII, andwhich 'areintended to separate work sheet 29 from roller lfl'.

Above roller Hi, there is provided a fingershaped guard 3 I, extendinginto the range on operation of 'rillers. l9 and I4, and is intended toprevent any accidental back flap of sheet 29, after it haspassed betweenrollers l and I4.

Adjacent to roller 10, at the left hand side, there is seen a beltconveyor 32, operating with-- in a cover 33, which latter is intended toprevent Y the dissipation of heat emanating from heater 34. Conveyor 32is directly driven from work F supporting roller ll,,as indicated at 35.

The purpose of roller l3 operating in adhesive medium I2 is to providethe surface of the work supporting roller with a tacky film, controlledby blade 13, which film, when very thin, rapidly point between rollers13 and l4,'the tackiness of v the surface of roller Ill strips'the workfrom a material which does not require being stripped ing body stiffness'requlresn'o 8 11 1 11 8 means,

and coating and stripping of such material' provided suitableapertures,indicated/at". from 75 .off point between rollers, the work ismechanfolding up of the work passing towards con 'veyor 32;

evaporates and increases its tackiness,- whereby the undersurface of thework is caused to adhere to-th'e surfaceof roller I 3. In thismanner,'the work is propelled by roller i9, while a coating is appliedto the upper, surface'of'the workv by roller l4. I Themoment the workpasses the contacting possible adherence to roller i4, thus enabling thework being propelled towards conveyor 32.'

Immediately after having passed the strippingically stripped from'thework supporting roller ll by means of stripper fingers 39. Guard 3i isintended to prevent possible crumpling or It'is to be borne in team thatmy device is pri marily intended to handle sheets of work hav-j xingnoinherent body firmness, as compared with cardboard, tin, fibre, or anyother relatively stiff inthe manner described above. Material havplyingroller l4 upon being coated, and therefore is shown in Fig.3, in whichagain a vessel 38 is vbe also observed that above the strippers and beisillustrate'din Fig. 4, in which is again 'shown a vessel 5|, providedwith a tack-producing me- 7 However, work in the form, of sheets ofpliable, soft materiaiwill naturally'adhere to the ap requires beingpried away from the coating roller,

'- which function is accomplished .-by the employ- .ment of the movablesupport, which attracts the lower surface of the work while propellingit,

and without marring or coating that lower surface.

These results are obtained by the employment of a tack-producingmaterial, which, uponbeing caused to form a thin, uniform surface,readily gives up its volatiles and becomes a relatively dry. adhesive,which will not'transfer to the work, but will remain upon the surface ofroller iii.

A similar device for coating and simultaneously stripping work in theabove described manner is illustrated containing a. tack-producing me-'dium 36', and in which is rotatably mounted a work-supporting andpropelling roller31. The

9 thickness of the coating isagain controlled by a flexible blade 38.Above roller 31, there will be Seen the coatingapplying roller 39, whichis offset in relation to roller 31. Above roller 39, is placed transferroller 43, which also contacts with supply roller 4|, operating withinvessel 42, filled with coating material 43. The amount of coating sup-'plied by roller 4| is governed by doctor roller 44.

In front of work-supportingroller 31 is again seen a feeder 45, whichdelivers sheets between rollers 31 and 39. At the left of roller 31isagain provided a series of stripper fingers 46, and adjacent to thesefingers is an intermediate conveyor 41, cooperating with conveyor 43,the latter corresponding to conveyor '32 ofFigLl. It will tween a seriesof rollers 39, there is provided again a guard 49, for preventing thesheet from flapping over' or crumpling after it was stripped fromrollers 31 and 39. v

The difference between the construction shown in Fig. 3 and thatillustrated in Fig. 1, is that in, Fig. 3 the coating material elevatedby roller-4| is transferred to roller 40, and is brought over toapplying roller 39 in a just. opposite relation to that shown in Fig.1.- Consequently, there is formed a puddle 59, between rollers 43 and39, which'puddle may be regulated as to its size by adjusting roller 49against roller 39. This puddle amount of j coating material upon roller39, which is of rather serious importance. In Fig. 1 the puddle is notreadily seen, although it is also formed, but due to its invisibility,its control is rather difficult.

" A'more simplified form of my coating device dium 52, in which operatesa' work-supporting roller 53, .and with which cooperates a governingblade 54, which controls the thickness of the film 65 ofthetack'produclng medium elevated by roller 53. In cooperation with thelatter roller, there will be. seena coating applying roller above whichroller is shown a controlling or doctor roller.

5s. Th coating material is delivered from closed 7o vessel 51 throughone' 'or more pipes, which 4 pipes terminateabove roller or rollers 55.-

- The coating material is formed'intoia mist or 'spray'by means of anair jacket 59, in which are the usual work .ducing medium 65, in whichwhich air, under-pressure, bears against the flow of the coatingmaterial issuing from tip ofpipe or pipes 58. Between rollers 55 and I,there is again shownthe formation 'ofa puddle .Si, for of coating to beapplied To the right of rollers feeder 62, while at the; left is shownthe usual series of stripper fingers 03 and the conveyor 64. In thisfigure, the guard, shown in Figs. '1 and 3, is omitted. Howevenit may bealso providedin connection with this construction.

Referring now to .Fig. 5, there is illustrated a vessel 65, which againis filled with a tack-prolatter work support- 'Blade 68 controls the thetack-producing ma- 61. To the right of the roller there is a feeder B9,and at the left, there is seen stripper fingers 10 and conveyor ii.Immediately above roller 1, there is shown a device similar to thatillustrated in Fig. .4, and consisting of a closed supply tank 12,filled with coating ing roller 61 operates. thickness of the film ofterial elevated by roller material, from which tank. issues one or morepipes 13, which are surrounded at their delivery end with an air jacket14, through which air pressure is directed by apertures I5, against theflow near the work-supporting of coating material issuing from pipe it.

It will be observed that in this modification, not only the spraying ofthe coating material is accomplished by the air pressure from jacket It,but at the same time, the position of the Jacket is so terial to becoated is urged against the roller in lieu of an applying roller, suchas illustrated in Fig. 4 at 55. In this modified form, is entirelyproduced by spraying, and lends itself to providing coating upon thework either in the form of stripes, orover the entire sheet, or any partthereof, all depending upon the arrangement and the number ofspraysprovided above roller bl. I I s I I In all of theillustrations shown,the coating and stripping operation is'intended for material in sheetform, which is relatively soft and pliable, and which does not. possessinherent body firmness, and would ordinarily require the employment ofgrippers throughout the coating operation, and it is.the principle ofthis invention to produce such coating and to strip the work by tractionwill counteract the adhesive action of partial or full the employment ofa movable support, which will sufllciently attract the undersurface ofthe work to provide not only traction for propelling the work during thecoating operation, but which atth coating material.

3 "one of the important features 'of this invention also resides inthefact that such gripperless coating operation lends tinuous procedure,that is to say, that while the device is intended to handle individualsheets, the handling is so rapid that the sheets may be fed in acontinuous succession, each other'but by little spaces, or practicallyabutting with one another, thereby similating the coating of acontinuous web, such-as a gummed tape.

It is also to of the devices illustrated may be employed for what isknown as strip coating, that is, to provide I one or any number ofstrips upon the surface of the work to be coated or may be employed forsurface coating, as may be desired. lying rollers are Forthispurposa'the coating a a and 55, there is seen continuous and closesuccession,

shown depends upon a I surface, while coating roller 61, that themadrailring are capable the coating itself to an almost con- 1 eitherseparated from I be borne in mind that either one operation with said I3 exchangeable and adiustabiereiativeto one another and relative to I InFig. 2, there is illustrated a series of rollers for strip coating.Their distance may be altered and rollers of different widths maybeemployed. By the same token, a solid roller may be employed over theentire width of the work supporting roller, thereby providing coatingover the entire surface at the work. The same principle applies to theillustration shown in Figs. 4 and 5.

summarizing, allof the-devices described and illustrated in the formsshown, or in any desired modified arrangement, are'intended forgripperless coating and handling of work consistingof individual,relatively soft and pliable sheets, which do not possess suillcient bodyfirmness to follow unaided throughout the coating operation, and whichsheets are intended to be coated in I so as to similate the coating of acontinuous web.

Furthermore, the operation of all-of my devicesmovable work supportwhich not only supports, but propels the work during the coatingoperation, and which also provides for the stripping of the work from acoating applying roller, if such device is employed, suchwork-supporting roller being so designed as to temporarily attract theundersuriace of the work successively at all points of the work, withoutcoating or marring such underis supplied to the opposite face of thework at the points where and while the work is being attracted by thework-supporting roller.

Obviously, the difierent structures shown in the demands'suchmodification, for myself the right to work to be handled and I thereforereserve make changes and improvements in my invention as may becomenecessary, without departing from the broad scope thereof, as set forthin the annexed claims- I claim: a

1. In a gripperless coating device for handling work in the form ofindividual sheets of relatively soft, pliable material, possessinglittle or no inherent bodyflrmness, and which sheets are to be coated ina continuous, close succession, so as to similate the coating of acontinuous web, movable work supporting and propelling means, providedwith a work engaging, tacky surface film designed, while said means arein motion, to temporarilyattract and release, successively, all pointsof one face of the work. lying between its two ends, without coating ormarring that one work surface, and means in cooperation with-gsaidpropelling means for simultaneously coating the opposite face of thethus 2.111 a gripperless coating device for handling work in the form ofindividual sheets of relatively soft,pliable material, possessing littleorno inherent body firmness, and which sheets are to be coated in acontinuous, close succession, so as to similate the coating of acontinuous web, movable work supporting and propelling means, having anadhesive, non-transferring illm surface, and adapted, while in motion,to temporarily attract and release, successively, all points of one faceof the work, coating applying means, in coformer means, adapted to forcethe work there'against and simultaneously apply a coating to'theopposite face of the moving work, at substantially the points ofattraction.

attracted and propelled work, at the points of attraction.

the work-supporting rollers.

of beingmodified when the 3. In a gripperlessjcoating device forhandling work in the form of individual sheetsof relatively.

soft, pliable materiaL'possessinglittle or no inherent body firmness,and which sheets are to be coated in a continuous, close succession, soas to similate the coating of a continuous web, movable work supportingand propelling tacky. readily evaporative adhesive means, means incooperation therewith for rendering its moving supporting surfacework-attracting, thereby facilitating a, temporary attraction and animmediately following release, successively, 'of all points of theentire undersuri'ace of the work, coating apply- 11 ing means incooperation with said movable work supporting-means, constructedand'arranged to force the work against the latter and to simul-'taneously coat its upper surface, while the undersurface of the work isthus temporarily attracted for the purpose of moving the work.

4. In a gripperless coating device for handling work in the form ofindividual sheets of relatively soft, pliable materiaL'possessing littleor-no in-'- herent body firmness, and which sheets areto becoated in acontinuous, close succession, so as to similate the coating of acontinuous web, rotary work supporting means for supporting theundersurface of, and for propelling the work, said means operativelymounted in a tack-producing medium for rendering its work-supportingsurface work-attracting, minutely adjustable, highly flexible mediumcontrol means cooperating with said rotary work supporting means, andcoating applying means constructed. and arranged to simultaneously forcethe work against said rotary means and to apply a coating to the uppersurface ofthe work, while the latter is inmotion, and substantially atthe moment of attraction,

and substantially opposite-the area of the undersurface which becomesattracted.

5. In -a gripperless-coating'device for handling work in the form ofindividual sheets of relatively soft, pliable material, possessinglittle orno inherent body firmness, and which sheets are to be coated ina continuous, close succession, so as to similatethe coating of acontinuous web, a

rotary work supporting and propelling element, a i

rotary coating applying element, in cooperation therewith, atack-producing medium covering in a thin, controlled layer thesupporting surfaceof said propelling element for rendering that surfacework-attracting, control means ior said medium in the form of a finelyadjustable, highly resilient blade, in cooperation with said; workpropelling element, said coating element constructed and arranged toforce the unde'rsurfa'ce of the work against the propelling element andto'simul- 'taneously coat the upper surface of the work,

while the work is in motion, substantially opposite to-the attractedarea of'the undersurface and substantiallyduring the period that areaofthe undersurface becomes attracted.

6. In a gripperless coating device for handling work in the form ofindividual sheets of relatively soft, pliable material, possessinglittle or no in-,

herent body firmness, and which sheets are to be 'coated in acontinuous, close succession, so as to similate the coating of acontinuous web, a rotary work supporting and 1 propelling element,coating applying means in cooperation therewith and constructed and Iarranged to urge the work against said element and to simultaneouslyapply a coating to the upper face of the work, and controlled,tack-producing means, adhering-to, and

designed to render the work-supporting surface, I

of said element work-attracting, for-the purpose of operativelyengagingthe' underface of the work, thus facilitating the propulsion ofthe work, at the moment its upper face receives a coating from' saidapplying means, and resilient, finely adiustable'control means for saidtackproducing means, in cooperation with said rotary propelling element.

7. In a gripperless coating device for handling work in the form ofindividualsheets of relatively soft, pliable material, possessing littleor no inherent body firmness, and which sheets are to be coated in acontinuous, close succession, so as to similate the coating of acontinuous'web, a rdtary work supporting and propelling elementoperatively mounted in a controlled, tack-producing medium, adapted torender its work-engaging surface work-attracting, for the purpose of Ipropelling the work by way of attracting, its un-' dersurface,resilient, finely adjustable means for controlling thethickness of saidmedium carried bysaid propelling element, in cooperation with thelatter, and coating applying means distanced from, but in cooperationwith said element, con

structed and arranged to force the, undersurface of the work against thelatter, and to simul-.

taneously apply a coating upon the free, upper surface of the work,-atsubstantially the moment when, and over substantially -thearea'where theundersurface of the work becomes attracted.

8. In a grip'perless coating device for handling 5 work in the form ofindividual sheets of relatively soft, pliable material, possessinglittle orno inherent body firmness, and which sheets are to be coated ina continuous, close succession, so

as to similate the coating (if-a continuous web,

-a vessel containing a tack -producing medium,

a rotarywork-suppor'ting and work-propelling posed above, but distancedfrom said cylinder,

and constructedand arranged to force the undersurface of the workagainst the work-supporting,

tacky surface of themoving cylinder, while simultaneously applying acoating upon the uppersurface of the work, at substantially the momentthe undersurface of the work becomes attracted. 9. In a gripperlesscoating device, as setforth in claim 1 and flnger-shapedmeans' incooperation with and .within the range of operation of said worksupporting and propelling means, for preventing the coated work fromdeviating from its intended course of progress. V I A 10. In agripperless and disposed above said work crumpling oi thecoated work.

FRANK P. cAmsoN.

coating device of claim 1; a finger-shaped work guard incooperation withS pporting, and propelling means-for. preventing a back flap or'

